For those who prefer to avoid solutions like iCloud Photos and Dropbox for backing up photos, you can sync your iPhone photos with Syncthing. To do this, you'll need two things:
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Möbius Sync is, to my knowledge, the only actively-maintained Syncthing client for iOS. It's free to sync up to 20 MB, and only $4.99 (one-time) to remove that limit.
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PhotoSync is a nifty iOS app for syncing photos to a number of different destinations. It's free for low-quality